.container {
    width: 100%;
    overflow: hidden;
}

.itembox {
    display: flex;
    flex-wrap: wrap;
    margin-top: 1rem;
    min-height: calc( 100vh - 200px);
}

.itembox .item {
    margin: 0 1%;
    width: 98%;
}

a {
    color: #5a5a5a;
}

img {
    width: 100%;
}

.photonic-footer {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    list-style: none;
    font-size: 1rem;
    width: 100%;
    margin: 0;
    padding: 0;
    height: 60px;
}

.photonic-footer h2 {
    font-size: 16px;
}

.photonic-footer li:not(:last-child):after {
    content: '/';
}

.photonic-footer li a {
    text-decoration: none;
    padding: 0 5px;
    text-decoration: underline;
}

@media (min-width: 1200px) {
    .container {
        width: 1200px;
        margin: auto;
    }
}

@media (min-width: 992px) {
    .itembox .item {
        flex: 0 0 31.33%;
        width: 31.33%;
    }
}

header{height: 80px;}
.title,.title a {
    text-align: center; 
}
.newsbox{display: flex;flex-wrap: wrap;align-content: flex-start; justify-content: space-between;min-height: calc(100vh - 160px);}
.menubtn {
   width: 100%;
}
.menubtn ul{list-style: none;padding: 0;margin: 0;}
.menubtn ul li{border-bottom: 1px solid #cccccc;}
.menubtn ul li a{padding: 1rem;display: block;text-decoration: none;}

@media (min-width: 992px){
    .menubtn{flex:0 0 25%;}
    .newsbox {min-height: calc(100vh - 110px - 80px);}
    .news-content {
        flex: 0 0 73%;
        
    }
}